44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(
    input [7:0] bus,
    output all_known,
    output has_unknown,
    output [7:0] bus_if_known
);

    wire w = ^{bus, bus} === 1'bx;

    assign all_known = w ? 1'b0 : 1'b1;
    assign has_unknown = w ? 1'b1 : 1'b0;
    assign bus_if_known = w ? 8'b0 : bus;
endmodule